She saw people who knew all about themselves. They knew their own style, their own manner of speaking, what slang they used, how they typed, how they acted, what they did.
Some had everything down.
She was always saying how 'she was still figuring out who she was.' She had been saying that phrase for some time now. Then it hit her.
Maybe... Maybe people aren't supposed to know who they are. As they continue on through life, they change. There really isn't a constant.
When people ask 'Who are you?' the usual response is a name. What they're called by. They don't respond with details about themselves. So maybe 'Who are you?' is really 'What's your name?'
People have characteristics. Someone might be able to answer 'Who are you right now?' But they cannot answer 'Who are you?' as a general forever. You just never know.
So she'll stick to her usual answer, and need no explanation.
'I am Kayla.'